Viruses and You
I'm writing this in response to the question: "Do you think that a virus dilutes, i.e. reactions to it lessen, as it is passed from person to person over time?"
Well, the simple answer is no. Viruses are very strange creatures. There's still some debate about whether they can actually be considered living things. One thing is certain, though: viruses are able to reproduce by destroying living cells. Viruses are much more difficult for our immune system to deal with than bacteria or other foreign bodies, so if they're not dealt with, they continue to reproduce, damaging your cells in the process. If left unchecked, viruses can even kill.
When a virus gets transmitted to a new person, that person may not experience symptoms right away because the virus has not spread throughout the body yet. But once inside the body, it'll start reproducing as usual. Unless an infected person takes care not to come in contact with others (or the others avoid contact with them), the amount of times a virus can spread to new people is limitless.
The only way to really stop the virus is to kill it. Unfortunately, this is difficult for our bodies to do. Simply getting bedrest and drinking lots of fluids won't do the trick. If you think you are at risk or already have contracted a virus, it's best to consult your doctor.